cast iron tube的用法和樣例：
例句
- Drains which pass under a house must be of cast iron, the most expsive material for pipe drains.
穿過房屋下面的排水管道，必須使用鑄鐵管，這是排水管所用的最昂貴的材料。 - This paper describes the character of vermicular cast iron pipe and the use of it in the sub-high pressure town gas pipeline.
本文重點闡述蠕墨鑄鐵管的性能和用於城市次高壓煤氣管網的可行性。
